| Title |
Application of Integrated Modelling Framework Consisted of Delft3D and HABITAT for Habitat Suitability Assessment |
| Authors |
임혜정 ( Hyejung Lim ) ; 나은혜 ( Eun Hye Na ) ; 전형철 ( Hyeong Cheol Jeon ) ; 송호진 ( Hojin Song ) ; 유호준 ( Hojun Yoo ) ; 황순홍 ( Soon Hong Hwang ) ; 류희성 ( Hui-seong Ryu ) |
| DOI |
https://doi.org/10.15681/KSWE.2021.37.3.217 |
| Keywords |
Delft3D model; HABITAT model; Habitat suitability assessment; Yeongsan river |
| Abstract |
This paper discusses a methodology where an integrated modelling framework is used to quantify the risk derived from anthropic activities on habitats and species. To achieve this purpose, a tool comprising the Delft3D and HABITAT model, was applied in the Yeongsan river. Delft3D effectively simulated the operational condition and flow of weirs in river. In accuracy evaluation of the Delft3D-FLOW, the Bias, Pbias, Mean Absolute Error (MAE), Nash-Sutcliffe Efficiency (NSE), and Index of Agreement (IOA) were used, and the result was evaluated as grade above ‘Satisfactory’. The HABITAT calculated Habitat Suitability Value (HSV) for the following eight species: mammal, fish, aquatic plant, and benthic macroinvertebrate. An Area was defined as a suitable habitat if the HSV was larger than 0.5. HABITAT was judged accurately by measuring the Correct Classification rate (CCR) and the area under the ROC curve (AUC). For benthic macroinvertebrate, the CCR and AUC were 77% and 0.834, respectively, at thresholds of 0.017 and 4 inds/㎡ for HSV and individuals per unit area. This meant that the HABITAT model accurately predicted the appearance of the benthic macroinvertebrates by approximately 77% and that the probability of false alarms was also very low. As a result of evaluating the suitability of habitats, in the Yeongsan river, if the annual “lowest level” (Seungchon weir: 2.5 EL.m/ Juksan weir: -1.35 EL.m) was maintained, the average habitat improvement effect of 6.5%P compared to the ‘reference’ scenario was predicted. Consequently, it was demonstrated that the integrated modelling framework for habitat suitability assessment is able to support the remedy aquatic ecological management. |